MESON Chess Problem Database

Problem Display
PID: 82217 (4r3/3B1bp1/1N6/n3p3/KQp1k1Nn/1p2P3/4P3/5R2 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Die Schwalbe, 1978

4r3/3B1bp1/1N6/n3p3/KQp1k1Nn/1p2P3/4P3/5R2

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sg2
      • 2.Bf5#
    • 1...Sf5
      • 2.Bxf5#
    • 1...Sg6
      • 2.Bf5#
  • Tries
    • 1.Bc6+?
      • 1...Bd5
        • 2.Bxd5#
      • 1...Sxc6!
    • 1.Qd2?
      • threat
        • 2.Sf2#
      • 1...Re6
        • 2.Qd5#
      • 1...Be6!
    • 1.Qc3?
      • threat
        • 2.Sf2#
      • 1...Be6
        • 2.Qxe5#
      • 1...Re6!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Sf2#
      • 1...Re6
        • 2.Qd5#
      • 1...Be6
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(d);N_GUARD::B(H)
    • S(d);N_GUARD::B(H),XS(d)
  • Tries
    • Try
      • B(H);CHECK
      • Vars
        • B(g);N_GUARD,P_SPINB(g)::B(H),XB(g)
      • Refutation
        • S(e);XB(H)
    • Try
      • Q(E);N_PINP(b)
      • Threat
        • S(F)
      • Vars
        • R(i);S_CUTB(g)::QAB1(E)
      • Refutation
        • B(g);
    • Try
      • Q(E);N_PINP(b)
      • Threat
        • S(F)
      • Vars
        • B(g);S_CUTR(i)::QAR1(E),XP(f)
      • Refutation
        • R(i);
  • Actual
    • Q(E);N_PINP(b)
    • Threat
      • S(F)
    • Vars
      • R(i);S_CUTB(g)::QAB1(E)
      • B(g);S_CUTR(i)::QAR1(E),XP(f)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).